Identify relation that is incorrect

Options

A.
B.
C.
D.

Answer

To solve the question of identifying the incorrect relation among the given pairs of compounds, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Molecular Formulas**:
- For each pair of compounds, write down their molecular formulas.
- Example: For the first pair, both compounds have the molecular formula C8H11N.

2. **Check for Isomerism**:
- Determine if the compounds are isomers by checking if they have the same molecular formula but different structures.
- Example: The first pair (C8H11N) are isomers, specifically anethyl aniline and 3,5-dimethyl aniline.

3. **Analyze Functional Groups**:
- For each pair, identify the functional groups present in the compounds.
- Example: In the third pair, both compounds have the formula C4H8O, but one is an aldehyde and the other is a ketone.

4. **Determine Relationships**:
- Assess whether the compounds are related based on their structural differences and functional groups.
- Example: The third pair is not related because they belong to different functional groups (aldehyde vs. ketone).

5. **Identify the Incorrect Relation**:
- After analyzing all pairs, identify which pair does not share a common relationship.
- Example: The third pair (C4H8O) is the incorrect relation since one is an aldehyde and the other is a ketone.

6. **Conclusion**:
- State the final answer clearly, indicating which option is the incorrect relation.
- Example: The incorrect relation is option 3.

### Final Answer:
The incorrect relation is option 3, where one compound is an aldehyde and the other is a ketone, despite having the same molecular formula (C4H8O).